mirror of https://gerrit.osmocom.org/libosmocore
gsm0808: Add utils for Channel Type
The planned support for true A over IP requires the encoding of the a Channel Type element (see also ASSIGNMENT REQUEST). This commt adds encoding/decoding functionality and tests for the element mentioned above, however, it is not yet actively used. Change-Id: Id0e2164d84b8cbcc6fe6a090fc7f40a1251421d7
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@ -47,3 +47,11 @@ uint8_t gsm0808_enc_speech_codec_list(struct msgb *msg,
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/* Decode Speech Codec list */
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int gsm0808_dec_speech_codec_list(struct gsm0808_speech_codec_list *scl,
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const uint8_t *elem, uint8_t len);
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/* Encode Channel Type element */
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uint8_t gsm0808_enc_channel_type(struct msgb *msg,
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const struct gsm0808_channel_type *ct);
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/* Decode Channel Type element */
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int gsm0808_dec_channel_type(struct gsm0808_channel_type *ct,
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const uint8_t *elem, uint8_t len);
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@ -438,3 +438,12 @@ struct gsm0808_speech_codec_list {
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struct gsm0808_speech_codec codec[SPEECH_CODEC_MAXLEN];
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uint8_t len;
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};
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/* 3GPP TS 48.008 3.2.2.11 Channel Type */
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#define CH_TYPE_PERM_SPCH_MAXLEN 9
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struct gsm0808_channel_type {
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uint8_t ch_indctr;
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uint8_t ch_rate_type;
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uint8_t perm_spch[CH_TYPE_PERM_SPCH_MAXLEN];
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unsigned int perm_spch_len;
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};
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@ -31,6 +31,8 @@
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#define IP_V6_ADDR_LEN 16
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#define IP_PORT_LEN 2
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#define CHANNEL_TYPE_ELEMENT_MAXLEN 11
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#define CHANNEL_TYPE_ELEMENT_MINLEN 3
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/* Encode AoIP transport address element */
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uint8_t gsm0808_enc_aoip_trasp_addr(struct msgb *msg,
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@ -306,3 +308,74 @@ int gsm0808_dec_speech_codec_list(struct gsm0808_speech_codec_list *scl,
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return (int)(elem - old_elem);
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}
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/* Encode Channel Type element */
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uint8_t gsm0808_enc_channel_type(struct msgb *msg,
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const struct gsm0808_channel_type *ct)
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{
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unsigned int i;
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uint8_t byte;
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uint8_t *old_tail;
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uint8_t *tlv_len;
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OSMO_ASSERT(msg);
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OSMO_ASSERT(ct);
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OSMO_ASSERT(ct->perm_spch_len <= CHANNEL_TYPE_ELEMENT_MAXLEN - 2);
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/* FIXME: Implement encoding support for Data
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* and Speech + CTM Text Telephony */
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if ((ct->ch_indctr & 0x0f) != GSM0808_CHAN_SPEECH
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&& (ct->ch_indctr & 0x0f) != GSM0808_CHAN_SIGN)
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OSMO_ASSERT(false);
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msgb_put_u8(msg, GSM0808_IE_CHANNEL_TYPE);
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tlv_len = msgb_put(msg, 1);
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old_tail = msg->tail;
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msgb_put_u8(msg, ct->ch_indctr & 0x0f);
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msgb_put_u8(msg, ct->ch_rate_type);
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for (i = 0; i < ct->perm_spch_len; i++) {
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byte = ct->perm_spch[i];
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if (i < ct->perm_spch_len - 1)
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byte |= 0x80;
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msgb_put_u8(msg, byte);
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}
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*tlv_len = (uint8_t) (msg->tail - old_tail);
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return *tlv_len + 2;
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}
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/* Decode Channel Type element */
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int gsm0808_dec_channel_type(struct gsm0808_channel_type *ct,
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const uint8_t *elem, uint8_t len)
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{
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unsigned int i;
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uint8_t byte;
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const uint8_t *old_elem = elem;
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OSMO_ASSERT(ct);
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if (!elem)
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return -EINVAL;
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if (len <= 0)
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return -EINVAL;
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memset(ct, 0, sizeof(*ct));
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ct->ch_indctr = (*elem) & 0x0f;
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elem++;
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ct->ch_rate_type = (*elem) & 0x0f;
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elem++;
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for (i = 0; i < ARRAY_SIZE(ct->perm_spch); i++) {
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byte = *elem;
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elem++;
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ct->perm_spch[i] = byte & 0x7f;
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if ((byte & 0x80) == 0x00)
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break;
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}
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ct->perm_spch_len = i + 1;
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return (int)(elem - old_elem);
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}
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@ -146,6 +146,8 @@ gsm0808_enc_speech_codec;
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gsm0808_dec_speech_codec;
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gsm0808_enc_speech_codec_list;
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gsm0808_dec_speech_codec_list;
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gsm0808_enc_channel_type;
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gsm0808_dec_channel_type;
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gsm0858_rsl_ul_meas_enc;
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@ -541,6 +541,36 @@ static void test_gsm0808_enc_dec_speech_codec_list()
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msgb_free(msg);
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}
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static void test_gsm0808_enc_dec_channel_type()
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{
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struct gsm0808_channel_type enc_ct;
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struct gsm0808_channel_type dec_ct;
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struct msgb *msg;
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uint8_t ct_enc_expected[] = { GSM0808_IE_CHANNEL_TYPE,
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0x04, 0x01, 0x0b, 0xa1, 0x25
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};
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uint8_t rc_enc;
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int rc_dec;
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memset(&enc_ct, 0, sizeof(enc_ct));
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enc_ct.ch_indctr = GSM0808_CHAN_SPEECH;
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enc_ct.ch_rate_type = GSM0808_SPEECH_HALF_PREF;
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enc_ct.perm_spch[0] = GSM0808_PERM_FR3;
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enc_ct.perm_spch[1] = GSM0808_PERM_HR3;
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enc_ct.perm_spch_len = 2;
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msg = msgb_alloc(1024, "output buffer");
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rc_enc = gsm0808_enc_channel_type(msg, &enc_ct);
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OSMO_ASSERT(rc_enc == 6);
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OSMO_ASSERT(memcmp(ct_enc_expected, msg->data, msg->len) == 0);
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rc_dec = gsm0808_dec_channel_type(&dec_ct, msg->data + 2, msg->len - 2);
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OSMO_ASSERT(rc_dec == 4);
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OSMO_ASSERT(memcmp(&enc_ct, &dec_ct, sizeof(enc_ct)) == 0);
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msgb_free(msg);
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}
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int main(int argc, char **argv)
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{
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printf("Testing generation of GSM0808 messages\n");
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@ -566,6 +596,7 @@ int main(int argc, char **argv)
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test_gsm0808_enc_dec_speech_codec_ext();
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test_gsm0808_enc_dec_speech_codec_ext_with_cfg();
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test_gsm0808_enc_dec_speech_codec_list();
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test_gsm0808_enc_dec_channel_type();
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printf("Done\n");
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return EXIT_SUCCESS;
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